<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        *{
            margin: 0;
            padding: 0;
        }
        .content{
            width: 1100px;
            margin: 0 auto;
            /* background-color: skyblue; */
            height: 800px;
        }
        .content .box{
            overflow: hidden;
        }
        .item{
            /* 使用新的盒子模型比较好 */
            box-sizing: border-box;
            width: 220px;
            height: 168px;
            background-color: orange;
            float: left;
            font-size: 24px;
            color: #fff;
            text-align: center;
            line-height: 168px;

            border: 1px solid #000;
            margin-right: -1px;
        }
        .item.first{
            width: 220px;
        }
    </style>
</head>
<body>
    <div class="content">
        <div class="box">
            <div class="item first">1</div>
            <div class="item">2</div>
            <div class="item">3</div>
            <div class="item">4</div>
            <div class="item">5</div>
        </div>
    </div>
</body>
</html>